Smoke a pack of cigarettes over the course of a few weeks, and then pay close attention to your body the first week you stop. You WILL crave cigarettes during that week. That is the feeling of physiological dependence. The pack of cigarettes has affected your body in ways you can't control. It isn't a "personality" thing (like other addictions which are purely psychological). Although, obviously, people will react differently to this subsequent craving, and will have different levels of strength in resisting it, if they desire to do so.

I do agree with you that the occasional cigarette can be very pleasurable.